Apple is a respiration-changing fruit, and its effect on atmosphere storage (CA) is excellent. In the absence of air-conditioned storage, plastic packaging or large-account storage is the best method for apple storage. The effect of spontaneous controlled atmosphere storage and refrigeration is better than that of controlled air-conditioning or refrigeration alone. The application of this technology requires a cold storage condition and a plastic bag or plastic account that meets the specifications. The operating procedures are as follows: 1. Harvesting harvest time has a great influence on apple's tolerance to Tibet. Harvesting is too early, the appearance of the fruit color and flavor is not good enough, and prone to physiological diseases; harvest too late, rapid aging during storage, flesh hair, browning and so on. Therefore, short-term storage can be delayed for a few days, and long-term storage can be harvested several days in advance. In general, fruit should be harvested when the fruit is fully grown, the flesh is tight but not soft, and the fruit surface has a good waxy texture. When harvesting, care must be taken to avoid mechanical damage. 2. Pharmaceutical treatment with a concentration of 3% to 4% calcium chloride solution can be controlled fruit bitter bean disease; 0.025% to 0.1% thiabendazole, 0.05% to 0.1% Benazet, thiophanate or multiple bacteria Soaking fruit can control anthrax. 3. Select fruits to remove pests, fruits, deformed fruit and poorly colored fruits. 4. Grading The fruits are sorted by size, which is conducive to packing neatly and improving the commercial quality of the fruit. 5. Pack in the fruit box lined with plastic film bags, into the apple, tied the bag mouth, each bag constitutes a sealed storage unit. General use of PE or PVC film bag, film bag storage generally high initial concentration of carbon dioxide, then gradually reduced. 6. The temperature in the freezer is kept at 0°C-0.5°C, and the air humidity is 90%-95%. The concentration of carbon dioxide and oxygen in the bag under refrigeration conditions is relatively stable. In the first two weeks of storage, the maximum concentration of carbon dioxide is reached and maintained at a certain level thereafter. For most varieties, controlling the lower limit concentration of oxygen 2% in storage, the upper limit concentration of carbon dioxide 7% is relatively safe, but Fuji apple's carbon dioxide concentration should not exceed 2%. Can also be packed boxes of apples, into the plastic film account storage: in the cold room with a plastic film account will be closed from the picking, thin film account is generally used 0.1 cm to 0.2 cm thick high-pressure polyvinyl chloride film, Sticking to rectangular bills can hold hundreds of kilograms to thousands of kilograms. Oxygen concentration can be controlled by rapid oxygen reduction, natural oxygen reduction and semi-natural oxygen reduction methods. In the middle and bottom of the large account wall, a silicone rubber diffuser window is affixed, which can naturally adjust the gas composition in the account, and is more convenient to use and manage. The area of ​​the silicon window is determined by experiments and calculations based on the storage capacity and the required gas ratio. 7. Notes 1 The large plastic account due to high humidity and often appear on the wall of the phenomenon of condensation, condensation of water droplets on the fruit easily lead to rot disease, should be fully covered before the fruit cover accounts and maintain a stable low temperature in the library to Reduced; 2 It should be pre-cooled in time, stored in cold storage in time, and pay attention to controlling the temperature and humidity in the later period of storage. Under the premise of no frost damage to the fruit, the lower the storage temperature during the whole storage period, the better the preservation effect.
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